xpcom/reflect/xptcall/src/md/win32/xptcinvoke_asm_x86_64.asm@b8a032363ba2 (annotated)
xpcom/reflect/xptcall/src/md/win32/xptcinvoke_asm_x86_64.asm
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | ; This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | ; License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 3 | ; file, You can obtain one at http://mozilla.org/MPL/2.0/. |
| michael@0 | 4 | |
| michael@0 | 5 | extrn invoke_copy_to_stack:PROC |
| michael@0 | 6 | |
| michael@0 | 7 | |
| michael@0 | 8 | .CODE |
| michael@0 | 9 | |
| michael@0 | 10 | ; |
| michael@0 | 11 | ;XPTC__InvokebyIndex(nsISupports* that, uint32_t methodIndex, |
| michael@0 | 12 | ; uint32_t paramCount, nsXPTCVariant* params) |
| michael@0 | 13 | ; |
| michael@0 | 14 | |
| michael@0 | 15 | XPTC__InvokebyIndex PROC FRAME |
| michael@0 | 16 | |
| michael@0 | 17 | ; store register parameters |
| michael@0 | 18 | |
| michael@0 | 19 | mov qword ptr [rsp+32], r9 ; params |
| michael@0 | 20 | mov dword ptr [rsp+24], r8d ; paramCount |
| michael@0 | 21 | mov dword ptr [rsp+16], edx ; methodIndex |
| michael@0 | 22 | mov qword ptr [rsp+8], rcx ; that |
| michael@0 | 23 | |
| michael@0 | 24 | push rbp |
| michael@0 | 25 | .PUSHREG rbp |
| michael@0 | 26 | mov rbp, rsp ; store current RSP to RBP |
| michael@0 | 27 | .SETFRAME rbp, 0 |
| michael@0 | 28 | .ENDPROLOG |
| michael@0 | 29 | |
| michael@0 | 30 | sub rsp, 32 |
| michael@0 | 31 | |
| michael@0 | 32 | ; maybe we don't have any parameters to copy |
| michael@0 | 33 | |
| michael@0 | 34 | test r8d, r8d |
| michael@0 | 35 | jz noparams |
| michael@0 | 36 | |
| michael@0 | 37 | ; |
| michael@0 | 38 | ; Build stack for stdcall |
| michael@0 | 39 | ; |
| michael@0 | 40 | |
| michael@0 | 41 | ; 1st parameter is space for parameters |
| michael@0 | 42 | |
| michael@0 | 43 | mov eax, r8d |
| michael@0 | 44 | or eax, 1 |
| michael@0 | 45 | shl rax, 3 ; *= 8 |
| michael@0 | 46 | sub rsp, rax |
| michael@0 | 47 | mov rcx, rsp |
| michael@0 | 48 | |
| michael@0 | 49 | ; 2nd parameter is parameter count |
| michael@0 | 50 | |
| michael@0 | 51 | mov edx, r8d |
| michael@0 | 52 | |
| michael@0 | 53 | ; 3rd parameter is params |
| michael@0 | 54 | |
| michael@0 | 55 | mov r8, r9 |
| michael@0 | 56 | |
| michael@0 | 57 | sub rsp, 40 |
| michael@0 | 58 | call invoke_copy_to_stack ; rcx = d |
| michael@0 | 59 | ; edx = paramCount |
| michael@0 | 60 | ; r8 = s |
| michael@0 | 61 | add rsp, 32 |
| michael@0 | 62 | |
| michael@0 | 63 | ; Current stack is the following. |
| michael@0 | 64 | ; |
| michael@0 | 65 | ; 0h: [space (for this)] |
| michael@0 | 66 | ; 8h: [1st parameter] |
| michael@0 | 67 | ; 10h: [2nd parameter] |
| michael@0 | 68 | ; 18h: [3rd parameter] |
| michael@0 | 69 | ; 20h: [4th parameter] |
| michael@0 | 70 | ; ... |
| michael@0 | 71 | ; |
| michael@0 | 72 | ; On Win64 ABI, the first 4 parameters are passed using registers, |
| michael@0 | 73 | ; and others are on stack. |
| michael@0 | 74 | |
| michael@0 | 75 | ; 1st, 2nd and 3rd arguments are passed via registers |
| michael@0 | 76 | |
| michael@0 | 77 | mov rdx, qword ptr [rsp+8] ; 1st parameter |
| michael@0 | 78 | movsd xmm1, qword ptr [rsp+8] ; for double |
| michael@0 | 79 | |
| michael@0 | 80 | mov r8, qword ptr [rsp+16] ; 2nd parameter |
| michael@0 | 81 | movsd xmm2, qword ptr [rsp+16] ; for double |
| michael@0 | 82 | |
| michael@0 | 83 | mov r9, qword ptr [rsp+24] ; 3rd parameter |
| michael@0 | 84 | movsd xmm3, qword ptr [rsp+24] ; for double |
| michael@0 | 85 | |
| michael@0 | 86 | ; rcx register is this |
| michael@0 | 87 | |
| michael@0 | 88 | mov rcx, qword ptr [rbp+8+8] ; that |
| michael@0 | 89 | |
| michael@0 | 90 | noparams: |
| michael@0 | 91 | |
| michael@0 | 92 | ; calculate call address |
| michael@0 | 93 | |
| michael@0 | 94 | mov r11, qword ptr [rcx] |
| michael@0 | 95 | mov eax, dword ptr [rbp+16+8] ; methodIndex |
| michael@0 | 96 | |
| michael@0 | 97 | call qword ptr [r11+rax*8] ; stdcall, i.e. callee cleans up stack. |
| michael@0 | 98 | |
| michael@0 | 99 | mov rsp, rbp |
| michael@0 | 100 | pop rbp |
| michael@0 | 101 | |
| michael@0 | 102 | ret |
| michael@0 | 103 | |
| michael@0 | 104 | XPTC__InvokebyIndex ENDP |
| michael@0 | 105 | |
| michael@0 | 106 | |
| michael@0 | 107 | END |
